EP1046030A1 - System for measuring humidity - Google Patents
System for measuring humidityInfo
- Publication number
- EP1046030A1 EP1046030A1 EP99971917A EP99971917A EP1046030A1 EP 1046030 A1 EP1046030 A1 EP 1046030A1 EP 99971917 A EP99971917 A EP 99971917A EP 99971917 A EP99971917 A EP 99971917A EP 1046030 A1 EP1046030 A1 EP 1046030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carrier element
- arrangement according
- sensor
- sensor unit
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
- G01N27/225—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity by using hygroscopic materials
Definitions
- the present invention relates to an arrangement for moisture measurement according to the preamble of claim 1.
- a sensor unit with a moisture-sensitive sensor element is arranged on a flat carrier element.
- the carrier element can be, for example, a printed circuit board or a circuit board.
- the required electrical contact between electrical components arranged on the printed circuit board for signal generation and processing and the sensor unit or the actual moisture-sensitive sensor element can be made via bond wires and corresponding soldered connections.
- contacting is also possible via connecting wires on the sensor unit, which are inserted into suitable contact bores on the side of the carrier element and soldered on the other side of the printed circuit board.
- Contacting variants of this type require a high outlay in terms of production technology, which is particularly noticeable in mass production. Automated assembly of printed circuit boards with such sensor units for moisture measurement is not possible or only possible with difficulty using these contacting methods.
- a locally selective system is also known from WO 98/27411, in which e.g. a sensor in the form of a moisture sensor with its moisture-sensitive sensor surface is arranged above the recess of a suitable carrier substrate.
- the electrical contacting of the sensor element takes place via flip-chip technology.
- a disadvantage of the proposed device is that, if certain carrier substrate materials are used, a falsification of moisture measurement values can result.
- the object of the present invention is therefore to provide an arrangement for
- the measures according to the invention now permit the automatic assembly of printed circuit boards, circuit boards or other carrier elements with moisture-sensitive sensor units, since the sensor units are designed as SMDs (Surface Mounted Devices).
- the sensor units are automatically placed on the intended positions of the carrier elements designed according to the invention via SMD automatic placement machines and fastened there and electrically contacted.
- the complete or simultaneous contacting of the sensor unit can take place, for example, by soldering or else fastening using conductive adhesive.
- the flip-chip technology now possible results in a significant reduction in the required process steps.
- the measures specified in the dependent claims in connection with the coating of the carrier element further ensure trouble-free functioning of the arrangement according to the invention in measuring operation, since this can prevent the formation of a falsifying microclimate in the vicinity of the sensor unit.
- Figure 1 is a plan view of an embodiment of the arrangement according to the invention.
- Figure 2 is a sectional view of the embodiment of Figure 1;
- FIG. 3 is a plan view of the moisture-sensitive sensor element used in the embodiment of Figure 1;
- Figure 4 is a sectional view of the sensor element
- FIGS. 1 and 2 show a plan view of the arrangement for moisture measurement in a schematic form;
- Figure 2 shows a sectional view through the arrangement.
- the arrangement shown comprises a carrier element 2, preferably embodied as a single-layer or multi-layer printed circuit board with electrical conductor tracks 5a, 5b arranged thereon or integrated therein, electrical components etc.
- the printed circuit board material can be, for example Glass fiber reinforced epoxy resins act, such as the well-known standard circuit board material FR4.
- a sensor unit 1 is now arranged on the carrier element 2 using the so-called flip-chip technology, which, among other things, contains a moisture-sensitive sensor element 1.1.
- the sensor element 1.1 is designed in a known manner and changes an electrical parameter depending on the respective humidity. In the case of a resistive moisture sensor arrangement, this is the moisture-dependent electrical resistance of a suitable sensor element 1.1. In the case of a capacitive moisture sensor arrangement, the measured capacitance of a corresponding sensor element 1.1 changes depending on the moisture.
- the sensor element 1.1 in the sensor unit 1 is preferably designed as a thin layer or thin-film sensor, as is described, for example, in chapter 20.4 in the textbook “Sensor Technology”, H.-R. Tränkler, E.
- sensor unit 1 or sensor element 1.1
- the structure of sensor unit 1 is only schematically outlined in FIG.
- the moisture-sensitive sensor element 1.1 is arranged on the underside of the sensor unit 1, ie on that side of the sensor unit 1 which faces the carrier element 2.
- the carrier element 2 has at least one recess 6 in the area in which the sensor unit 1 is arranged.
- the sensor unit 1 is arranged above the recess 6, the moisture-sensitive sensor element 1. 1 of the sensor unit 1 being arranged oriented in the direction of the recess 6.
- the layer surface faces the recess 6. This can preferably be done in such a way that the layer plane is arranged in the recess 6 or parallel to the plane of the recess 6.
- the recess 6 has been selected to be somewhat larger than the corresponding base area of the sensor unit 1 or the sensor element 1.1, which faces the carrier element 2. This results in an advantageous flow around the complete sensor unit 1 with the air to be measured and thus an improved moisture exchange with the sensor element 1.1.
- the invention further provides for all contacting areas or contact pads of the sensor element 1.1 or the sensor unit 1 to be arranged on the side which is assigned to the carrier element 2. In this way, a so-called flip-chip bonding of the sensor unit 1 on the carrier element 2 is possible.
- this contacting technology see, for example, chapter 6.6.2.2; Pages 277 - 278 in the textbook "Sensor Technology", H.-R. Tränkler, E. Obermeier, Springer-Verlag 1998.
- the contacting areas or contact pads of the sensor element 1.1 are accordingly on the underside of the sensor unit 1.
- the contacting areas of the sensor element 1.1 are electrically conductively connected to the contacting areas on the carrier element 2 with the aid of contacting elements 7a, 7b.
- the contacting elements can be applied in the form of a suitable solder paste to the contacting areas of the carrier element 2.
- the sensor unit 1 is then positioned in the correct place on the carrier element 2.
- the actual contacting is then carried out in a known manner by annealing the entire arrangement in the reflow oven.
- the contacting elements 7a, 7b between the sensor and carrier-side contacting areas can also be so-called “bumps” or bumps, consisting of electrically conductive solder material or conductive adhesive.
- the contacting elements 7a, 7b nor the fastening of the sensor unit 1 on the carrier element 2.
- the two electrodes of a capacitive moisture measuring arrangement are consequently contacted in an electrically conductive manner;
- the actual sensor element 1.1 is arranged as an active layer between the two electrodes, the capacitance of which changes depending on the moisture due to the water adsorption.
- the contacting areas provided on the carrier element 2 are in turn connected to two conductor tracks 5a, 5b, which thus connect the sensor unit 1 to a schematically indicated electronics unit 10.
- the electronics unit 10 contains further electrical components for signal generation and / or signal processing. These can be resistors, capacitors, comparators, operational amplifiers and possibly microprocessors etc.
- the carrier element 2 with an almost complete coating 3.
- the carrier element 2 or the printed circuit board is provided with a coating 3 made of copper almost over the entire surface.
- the coating 3 is also provided on the edges of the carrier element 2. It should also be pointed out that in the region of the recess 6, in which the sensor element 1.1 is arranged, the inner edges of the recess 6 are provided with the coating 3.
- Such an almost complete coating of the carrier element 2 with a suitable coating material is to be carried out at least in the immediate vicinity of the sensor unit 1 in order to prevent the formation of a falsifying microclimate.
- the respective coating material essentially has the function of preventing the undesired moisture absorption and / or release by the respective carrier element material.
- a nickel coating, a gold coating or a tin coating could also be provided.
- the coating 3 is of course not applied in the area of the contacting areas of the carrier element 2, where the contacting elements 7a, 7b are arranged, which is indicated in FIG. 2. As can also be seen in FIG. 1, no such loading is furthermore directly adjacent to the conductor tracks 5a, 5b on the carrier element 2. Layering provided to isolate the conductor tracks 5a, 5b from the copper coating.
- the conductor tracks are also made of copper, ie the respective coating material, so that the required conductor tracks can be produced by suitable structuring measures after the entire surface coating of the carrier element 2 with copper. This can be done in a known manner by an etching process.
- the coating 3 of the carrier element 2 is also provided with a second coating 4 in the form of a solder resist almost over the entire surface. Only in the contacting areas of the carrier element 2, where the electrical contacting of the sensor unit 1 takes place, is no second coating 4 provided.
- a suitable solder resist it should be mentioned that a material is selected for this, which in turn shows as little moisture absorption and release as possible, so that there is no disruptive, distorting microclimate in the area of sensor unit 1. Solder-resist lacquers that absorb less than 2% moisture are particularly suitable for this.
- the sensor unit 1 of the exemplary embodiment is described below with reference to FIGS. 3 and 4.
- 3 shows the underside of the sensor unit 1, which faces the carrier element 2;
- 4 shows a detailed sectional view through the sensor unit 1.
- the sensor unit 1 consists of a carrier substrate 1.3 made of glass, on which the actual moisture-sensitive sensor element 1.1 and the contacting areas 1.2a, 1.2b are arranged.
- the sensor element 1.1 designed in thin-film technology in turn consists of a flat, metallic base electrode 1.1c, which is arranged directly on the carrier substrate 1.3, a moisture-sensitive polymer arranged above it.
- Layer 1.1b and a moisture-permeable cover electrode 1.1a which is in turn arranged above it.
- the polymer layer 1.1 b between the two electrodes 1.1a, 1.1 c acts as a dielectric, changes its capacity depending on the respective moisture and thus serves in a known manner for the capacitive determination of the ambient moisture.
- a suitable material for the polymer layer 1.1b is, for example, polyyimide.
- the two electrodes 1.1a, 1.1c are connected to the two contacting areas 1.2a, 1.2b or contacting pads, via which the electrodes 1.1a, 1.1c are connected to the electronic unit 10 or other components indicated in FIG.
- a typical thickness of the glass carrier substrate is in the range from 500 to 600 ⁇ m; the thickness of the layers 1.1a, 1.1b, 1.1c arranged above is typically in the range of 2-3 ⁇ m.
- sensor unit is of course only one possible embodiment within the present invention. Accordingly, other sensor units can also be used for moisture measurement, in which the respective moisture-sensitive sensor element changes a different electrical parameter depending on the moisture; for example, resistive sensor elements could also be used, etc.
- sensor units constructed using thick-film technology can also be used, or sensor units that use semiconductor materials.
- Alternatives to glass can of course also be considered as substrate materials; these include ceramics or silicon etc.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0072498U AT3295U1 (en) | 1998-11-06 | 1998-11-06 | ARRANGEMENT FOR HUMIDITY MEASUREMENT |
AT72498 | 1998-11-06 | ||
PCT/EP1999/008165 WO2000028311A1 (en) | 1998-11-06 | 1999-10-28 | System for measuring humidity |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1046030A1 true EP1046030A1 (en) | 2000-10-25 |
EP1046030B1 EP1046030B1 (en) | 2002-09-04 |
Family
ID=3498144
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99971917A Expired - Lifetime EP1046030B1 (en) | 1998-11-06 | 1999-10-28 | System for measuring humidity |
Country Status (6)
Country | Link |
---|---|
US (1) | US6483324B1 (en) |
EP (1) | EP1046030B1 (en) |
JP (1) | JP4202606B2 (en) |
AT (2) | AT3295U1 (en) |
DE (1) | DE59902551D1 (en) |
WO (1) | WO2000028311A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7439750B2 (en) | 2003-04-12 | 2008-10-21 | E+E Elektronik Ges.M.B.H. | Sensor system and method for its manufacture |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4513161B2 (en) * | 2000-03-31 | 2010-07-28 | 東亞合成株式会社 | Gas sensor manufacturing method and gas sensor |
JP2002116172A (en) * | 2000-10-10 | 2002-04-19 | Ngk Spark Plug Co Ltd | Humidity sensor |
US7037112B2 (en) * | 2002-12-20 | 2006-05-02 | Kimberly-Clark Worldwide, Inc. | Virtual arm for measurement of humidity, temperature, and water vapor transmission rate in materials |
JP4160851B2 (en) * | 2003-03-31 | 2008-10-08 | 富士通株式会社 | Semiconductor device for fingerprint recognition |
JP3994975B2 (en) * | 2004-02-27 | 2007-10-24 | 株式会社デンソー | Capacitive humidity sensor |
JP2006010547A (en) * | 2004-06-28 | 2006-01-12 | Denso Corp | Humidity sensor module and humidity sensor mounting structure |
US7205779B2 (en) * | 2005-01-25 | 2007-04-17 | Jennings Thomas A | Apparatus and method for monitoring and determining the moisture content in elastomer materials |
JP2006344903A (en) * | 2005-06-10 | 2006-12-21 | Fujifilm Holdings Corp | Semiconductor module |
US7373819B2 (en) * | 2005-09-30 | 2008-05-20 | Honeywell International Inc. | Stress sensitive humidity sensor based on a MEMS structure |
DE102005062005A1 (en) * | 2005-12-22 | 2007-06-28 | Innovative Sensor Technology Ist Ag | Device for determining and/or monitoring process parameter(s), especially moisture or temperature, has supply channel(s) configured, positioned and adapted to sensor unit so medium passes through channel(s) essentially only to sensor unit |
DE102008053909A1 (en) * | 2008-10-30 | 2010-05-27 | Novar Gmbh | gas detector |
US9156600B2 (en) * | 2008-11-06 | 2015-10-13 | The Aerospace Corporation | Modified polyimides and moisture interactive materials and products including the same |
WO2010113712A1 (en) * | 2009-03-31 | 2010-10-07 | アルプス電気株式会社 | Capacitance type humidity sensor and method for manufacturing same |
DE102009053022A1 (en) | 2009-07-29 | 2011-05-19 | Curtius, Fritz | Device for efficiency diagnosis on basis of steam and water in ventilation systems such as dryers and structural units, has steam generator with feeding line and discharge line, in which direct contact with condensate is provided |
US8413505B2 (en) * | 2010-10-27 | 2013-04-09 | Gudeng Precision Industrial Co, Ltd | Temperature and humidity measuring device deployed on substrate |
JP5483443B2 (en) * | 2010-11-05 | 2014-05-07 | フィガロ技研株式会社 | Gas sensor and manufacturing method thereof |
JP5595230B2 (en) * | 2010-11-05 | 2014-09-24 | フィガロ技研株式会社 | Gas sensor |
DE102015203680A1 (en) * | 2015-03-02 | 2016-09-08 | Siemens Aktiengesellschaft | Method for producing an electronic circuit, assembly with an electronic circuit and manufacturing plant for producing an electronic circuit |
CH713645A2 (en) * | 2017-01-30 | 2018-09-28 | Signode Ind Group Llc | Strapping device with an actuating element of the clamping device. |
CN107389735A (en) * | 2017-05-22 | 2017-11-24 | 江苏时瑞电子科技有限公司 | A kind of preparation method of the humidity sensor based on molecular sieve |
EP3646016A1 (en) * | 2017-06-28 | 2020-05-06 | E+E Elektronik Ges.m.b.H. | Sensor device |
DE102022201926A1 (en) * | 2022-02-24 | 2023-09-07 | Volkswagen Aktiengesellschaft | Sensor element, in particular in the form of an SMD component |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH539848A (en) * | 1972-07-10 | 1973-07-31 | Sina Ag | Device for measuring the relative humidity of a gaseous medium |
JPS5431715B2 (en) * | 1972-09-20 | 1979-10-09 | ||
GB1464605A (en) * | 1973-08-14 | 1977-02-16 | Nippon Sheet Glass Co Ltd | Humidity-sensitive sensor |
EP0057728B1 (en) * | 1980-07-21 | 1986-05-28 | Hitachi, Ltd. | Moisture-sensitive element, moisture-sensitive material and manufacturing method for same |
US4337658A (en) * | 1980-10-14 | 1982-07-06 | Honeywell Inc. | Humidity sensor |
US4562725A (en) * | 1982-07-31 | 1986-01-07 | Shimadzu Corporation | Moisture sensor and a process for the production thereof |
DE3313150C1 (en) * | 1983-04-12 | 1984-10-04 | Endress U. Hauser Gmbh U. Co, 7867 Maulburg | Thin-layer moisture sensor for measuring absolute humidity and process for its production |
JPS61235745A (en) | 1985-04-11 | 1986-10-21 | Sharp Corp | Humidity sensor |
US4942364A (en) * | 1988-02-19 | 1990-07-17 | Asahi Kasei Kogyo Kabushiki Kaisha | Moisture and dew-detection sensor |
DE3924634A1 (en) | 1989-07-26 | 1991-01-31 | Otmar Greisinger | Electrical hygrometer sensor - has resistive film on substrate and contains hydrophilic material resulting in moisture dependent resistance |
US5179347A (en) * | 1992-04-10 | 1993-01-12 | Irrometer Company, Inc. | Electrical sensor for sensing moisture in soils |
US5345821A (en) | 1993-01-15 | 1994-09-13 | A.I.R., Inc. | Relative humidity sensing apparatus |
US5388443A (en) | 1993-06-24 | 1995-02-14 | Manaka; Junji | Atmosphere sensor and method for manufacturing the sensor |
US6351390B1 (en) * | 1996-12-17 | 2002-02-26 | Laboratorium Fur Physikalische Elektronik Institut Fur Quantenelektronik | Method for applying a microsystem or a converter on a substrate, and device manufactured accordingly |
-
1998
- 1998-11-06 AT AT0072498U patent/AT3295U1/en unknown
-
1999
- 1999-10-28 US US09/582,856 patent/US6483324B1/en not_active Expired - Fee Related
- 1999-10-28 EP EP99971917A patent/EP1046030B1/en not_active Expired - Lifetime
- 1999-10-28 AT AT99971917T patent/ATE223573T1/en active
- 1999-10-28 DE DE59902551T patent/DE59902551D1/en not_active Expired - Lifetime
- 1999-10-28 WO PCT/EP1999/008165 patent/WO2000028311A1/en active IP Right Grant
- 1999-10-28 JP JP2000581440A patent/JP4202606B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0028311A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7439750B2 (en) | 2003-04-12 | 2008-10-21 | E+E Elektronik Ges.M.B.H. | Sensor system and method for its manufacture |
Also Published As
Publication number | Publication date |
---|---|
WO2000028311A1 (en) | 2000-05-18 |
DE59902551D1 (en) | 2002-10-10 |
ATE223573T1 (en) | 2002-09-15 |
AT3295U1 (en) | 1999-12-27 |
US6483324B1 (en) | 2002-11-19 |
JP4202606B2 (en) | 2008-12-24 |
JP2002529733A (en) | 2002-09-10 |
EP1046030B1 (en) | 2002-09-04 |
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